diff --git a/docs/design/agent-api-contract.md b/docs/design/archive-2.0/agent-api-contract.md
similarity index 100%
rename from docs/design/agent-api-contract.md
rename to docs/design/archive-2.0/agent-api-contract.md
diff --git a/docs/design/architecture-v2.6.md b/docs/design/archive-2.0/architecture-v2.6.md
similarity index 100%
rename from docs/design/architecture-v2.6.md
rename to docs/design/archive-2.0/architecture-v2.6.md
diff --git a/docs/design/deployment-scripts.md b/docs/design/archive-2.0/deployment-scripts.md
similarity index 100%
rename from docs/design/deployment-scripts.md
rename to docs/design/archive-2.0/deployment-scripts.md
diff --git a/docs/design/deployment-v2.6-guide.md b/docs/design/archive-2.0/deployment-v2.6-guide.md
similarity index 100%
rename from docs/design/deployment-v2.6-guide.md
rename to docs/design/archive-2.0/deployment-v2.6-guide.md
diff --git a/docs/design/deployment-v2.6.md b/docs/design/archive-2.0/deployment-v2.6.md
similarity index 100%
rename from docs/design/deployment-v2.6.md
rename to docs/design/archive-2.0/deployment-v2.6.md
diff --git a/docs/design/development-plan-v2.6.md b/docs/design/archive-2.0/development-plan-v2.6.md
similarity index 100%
rename from docs/design/development-plan-v2.6.md
rename to docs/design/archive-2.0/development-plan-v2.6.md
diff --git a/docs/design/frontend-principles.md b/docs/design/archive-2.0/frontend-principles.md
similarity index 100%
rename from docs/design/frontend-principles.md
rename to docs/design/archive-2.0/frontend-principles.md
diff --git a/docs/design/frontend-redesign-v2.6.md b/docs/design/archive-2.0/frontend-redesign-v2.6.md
similarity index 100%
rename from docs/design/frontend-redesign-v2.6.md
rename to docs/design/archive-2.0/frontend-redesign-v2.6.md
diff --git a/docs/design/mail-fix-design.md b/docs/design/archive-2.0/mail-fix-design.md
similarity index 100%
rename from docs/design/mail-fix-design.md
rename to docs/design/archive-2.0/mail-fix-design.md
diff --git a/docs/design/polling-ux-proposal.md b/docs/design/archive-2.0/polling-ux-proposal.md
similarity index 100%
rename from docs/design/polling-ux-proposal.md
rename to docs/design/archive-2.0/polling-ux-proposal.md
diff --git a/docs/design/spawner-monitor-design.md b/docs/design/archive-2.0/spawner-monitor-design.md
similarity index 100%
rename from docs/design/spawner-monitor-design.md
rename to docs/design/archive-2.0/spawner-monitor-design.md
diff --git a/docs/design/technical-design-v2.6.md b/docs/design/archive-2.0/technical-design-v2.6.md
similarity index 100%
rename from docs/design/technical-design-v2.6.md
rename to docs/design/archive-2.0/technical-design-v2.6.md
diff --git a/docs/design/test-plan-v2.6.md b/docs/design/archive-2.0/test-plan-v2.6.md
similarity index 100%
rename from docs/design/test-plan-v2.6.md
rename to docs/design/archive-2.0/test-plan-v2.6.md
diff --git a/docs/design/toolchain-proposal.md b/docs/design/archive-2.0/toolchain-proposal.md
similarity index 100%
rename from docs/design/toolchain-proposal.md
rename to docs/design/archive-2.0/toolchain-proposal.md
diff --git a/docs/design/topic11-multi-project-proposal.md b/docs/design/archive-2.0/topic11-multi-project-proposal.md
similarity index 100%
rename from docs/design/topic11-multi-project-proposal.md
rename to docs/design/archive-2.0/topic11-multi-project-proposal.md
diff --git a/docs/design/topic3-challenge-review-proposal.md b/docs/design/archive-2.0/topic3-challenge-review-proposal.md
similarity index 100%
rename from docs/design/topic3-challenge-review-proposal.md
rename to docs/design/archive-2.0/topic3-challenge-review-proposal.md
diff --git a/docs/design/topic4-decomposition-skill-proposal.md b/docs/design/archive-2.0/topic4-decomposition-skill-proposal.md
similarity index 100%
rename from docs/design/topic4-decomposition-skill-proposal.md
rename to docs/design/archive-2.0/topic4-decomposition-skill-proposal.md
diff --git a/docs/design/topic6-experience-loop-proposal.md b/docs/design/archive-2.0/topic6-experience-loop-proposal.md
similarity index 100%
rename from docs/design/topic6-experience-loop-proposal.md
rename to docs/design/archive-2.0/topic6-experience-loop-proposal.md
diff --git a/docs/design/topic7-interaction-dashboard-proposal.md b/docs/design/archive-2.0/topic7-interaction-dashboard-proposal.md
similarity index 100%
rename from docs/design/topic7-interaction-dashboard-proposal.md
rename to docs/design/archive-2.0/topic7-interaction-dashboard-proposal.md
diff --git a/docs/design/topic9-dashboard-design.md b/docs/design/archive-2.0/topic9-dashboard-design.md
similarity index 100%
rename from docs/design/topic9-dashboard-design.md
rename to docs/design/archive-2.0/topic9-dashboard-design.md
diff --git a/docs/design/v2.7-subtask-model.md b/docs/design/archive-2.0/v2.7-subtask-model.md
similarity index 100%
rename from docs/design/v2.7-subtask-model.md
rename to docs/design/archive-2.0/v2.7-subtask-model.md
diff --git a/docs/design/v2.7.1-mail-envelope-separation.md b/docs/design/archive-2.0/v2.7.1-mail-envelope-separation.md
similarity index 100%
rename from docs/design/v2.7.1-mail-envelope-separation.md
rename to docs/design/archive-2.0/v2.7.1-mail-envelope-separation.md
diff --git a/docs/design/v2.7.2-counter-lifecycle-fix.md b/docs/design/archive-2.0/v2.7.2-counter-lifecycle-fix.md
similarity index 100%
rename from docs/design/v2.7.2-counter-lifecycle-fix.md
rename to docs/design/archive-2.0/v2.7.2-counter-lifecycle-fix.md
diff --git a/docs/design/v2.7.2-pipeline-refactor.md b/docs/design/archive-2.0/v2.7.2-pipeline-refactor.md
similarity index 100%
rename from docs/design/v2.7.2-pipeline-refactor.md
rename to docs/design/archive-2.0/v2.7.2-pipeline-refactor.md
diff --git a/docs/design/v2.8-changelog.md b/docs/design/archive-2.0/v2.8-changelog.md
similarity index 100%
rename from docs/design/v2.8-changelog.md
rename to docs/design/archive-2.0/v2.8-changelog.md
diff --git a/docs/design/v2.8-direction-notes.md b/docs/design/archive-2.0/v2.8-direction-notes.md
similarity index 100%
rename from docs/design/v2.8-direction-notes.md
rename to docs/design/archive-2.0/v2.8-direction-notes.md
diff --git a/docs/design/v2.8-executor-prompt-design.md b/docs/design/archive-2.0/v2.8-executor-prompt-design.md
similarity index 100%
rename from docs/design/v2.8-executor-prompt-design.md
rename to docs/design/archive-2.0/v2.8-executor-prompt-design.md
diff --git a/docs/design/v2.8-pipeline-architecture.md b/docs/design/archive-2.0/v2.8-pipeline-architecture.md
similarity index 100%
rename from docs/design/v2.8-pipeline-architecture.md
rename to docs/design/archive-2.0/v2.8-pipeline-architecture.md
diff --git a/docs/design/v2.8-state-enhancement.md b/docs/design/archive-2.0/v2.8-state-enhancement.md
similarity index 100%
rename from docs/design/v2.8-state-enhancement.md
rename to docs/design/archive-2.0/v2.8-state-enhancement.md
diff --git a/docs/design/v2.8-task-type-pipeline.md b/docs/design/archive-2.0/v2.8-task-type-pipeline.md
similarity index 100%
rename from docs/design/v2.8-task-type-pipeline.md
rename to docs/design/archive-2.0/v2.8-task-type-pipeline.md
diff --git a/docs/design/v3.0-router-refactor.md b/docs/design/archive-2.0/v3.0-router-refactor.md
similarity index 100%
rename from docs/design/v3.0-router-refactor.md
rename to docs/design/archive-2.0/v3.0-router-refactor.md
diff --git a/docs/design/v3.0-ux-simplification.md b/docs/design/archive-2.0/v3.0-ux-simplification.md
similarity index 100%
rename from docs/design/v3.0-ux-simplification.md
rename to docs/design/archive-2.0/v3.0-ux-simplification.md